Which light structure is characterized as a white octagonal tower with a red upper portion?

The Nine Mile Point Light is characterized by its distinct architectural design, featuring a white octagonal tower with a red upper portion. This specific design makes it easily recognizable among other light structures in the region. The combination of the white base and red upper section serves not only an aesthetic purpose but also enhances visibility against the natural landscape and helps navigation, particularly in challenging weather conditions.

The other light structures mentioned do not share this specific color scheme and shape, which is what distinctly identifies the Nine Mile Point Light. Each lighthouse has its unique characteristics based on historical and practical considerations, but in this case, the combination of an octagonal shape with the specific coloring makes the Nine Mile Point Light stand out as the correct answer.